Waveguide quantum electrodynamics (QED) studies interactions between atoms and various one-dimensional open waveguides. It provides an excellent platform for achieving strong light-matter interactions due to the strong transverse confinement on the electromagnetic fields [1]}, [2]}. Different from cavity QED systems, where atoms are commonly coupled with a single or multiple discrete modes in bounded spaces, atoms can interact with a continuum of modes in waveguides, similar to those of a thermal reservoir [2]}. In view of this, many disadvantages presented in cavities can be evaded in waveguide QED systems, such as limited bandwidth of emitted photons and stochastic release of cavities [4]}. Since the first experimental realization in 2007 [5]}, waveguide QED has brought out a great deal of advances, e.g., chiral photon-atom interactions [6]}, [7]}, [8]}, single-photon routers [9]}, [10]}, [11]}, and topologically induced unconventional quantum optics [12]} to name a few. In particular, waveguide-mediated interactions between far apart atoms (resonators), which can be tailored to be either coherent or dissipative, exhibit important applications in achieving large-scale quantum networks [13]}, [14]}, [15]}, [16]}, [17]}, [18]}.
